OpenMP Metrics

When processing a clock-profile event for an OpenMP program, two metrics corresponding to the time spent in each of two states in the OpenMP system are shown: OpenMP Work and OpenMP Wait.

Time is accumulated in OpenMP Work whenever a thread is executing from the user code, whether in serial or parallel. Time is accumulated in OpenMP Wait whenever a thread is waiting for something before it can proceed, whether the wait is a busy-wait (spin-wait), or sleeping. The sum of these two metrics matches the Total LWP Time metric in the clock profiles.